The mass of 12.82 moles of lithium (Li) atoms is 88.89 g.
The molar mass of Lithium (Li) is 6.94 g/mol. Therefore, the mass of 12.82 moles of lithium (Li) atoms can be calculated as follows:
The number of moles of lithium (Li) = 12.82 mol
Molar mass of Lithium (Li) = 6.94 g/mol
We know that the mass of one mole of an element is equal to its atomic or molecular mass in grams.Therefore, the mass of 1 mole of Li atoms is equal to its molar mass which is 6.94 g/mol.
Then the mass of 12.82 moles of Li atoms can be found using mole to mass conversion as follows:
Mass = Number of moles × Molar mass
= 12.82 mol × 6.94 g/mol
= 88.89 g.
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